Degradation of imidacloprid insecticide in a binary mixture with propylene glycol by conventional fenton process

doi:10.1515/jaots-2017-0012

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標題:	Degradation of imidacloprid insecticide in a binary mixture with propylene glycol by conventional fenton process
作者:	de Luna, Mark Daniel G. Retumban, Joseph D. Garcia-Segura, Sergi Lu, Ming-Chun
貢獻者:	Univ Philippines, Coll Engn, Environm Engn Grad Program Natl Univ, Coll Engn Chia Nan Univ Pharm & Sci, Dept Environm Resources Management
關鍵字:	Fenton water treatment technologies pesticide persistent organic pollutants advanced oxidation processes hydroxyl radical
日期:	2017-07
上傳時間:	2018-11-30 15:52:34 (UTC+8)
出版者:	Walter De Gruyter Gmbh
摘要:	Imidacloprid is one of the most widely used insecticides in agriculture. The fate of this highly recalcitrant pollutant and its by-product of incomplete degradation in water is of great concern due to the hazardous effects usually associated to pesticides. In the present manuscript, imidacloprid degradation by hydroxyl radical produced in-situ by conventional Fenton process is discussed. Furthermore, it has been studied the influence of propylene glycol, which is a usual excipient found in the commercial pesticides containing imidacloprid, on the conventional Fenton process performance. A two-stage degradation kinetics was observed: (i) a rapid initial decay on the first 5 min of treatment, followed by (ii) a slower kinetics defined by the Fenton-like reaction of Fe2+ catalyst regeneration. The influence of several variables on the abatement of imidacloprid such Fe2+ and H2O2 initial concentration or propylene glycol ratios have been evaluated. Experimental results demonstrate that complete imidacloprid abatement is attained under optimal conditions of 8.0 mM of H2O2 and 0.8 mM of Fe2+ after 120 min of treatment at acidic pH. However, increasing concentrations of propylene glycol diminishes the overall performance due to the competitive consumption of hydroxyl radicals.
關聯:	Journal of Advanced Oxidation Technologies, v.20, n.2
显示于类别:	[環境資源管理系(所)] 期刊論文

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